Standard ATX size is 12 x 9.6 inches, E-ATX is 12 x 10.7, and XL-ATX is 13.5 x 10.3 inches. If your current case has room for an extra inch of motherboard at the front, you may have to move some standoffs to mount the board. Any case that is XL-ATX sized should fit an E-ATX with room to spare. The I/O panel is in the same location for all 3 sizes.